[[alternative]]A New Structure for FBG Strain Sensor with FFPI Filter

碩士機電工程學系[[abstract]]在本篇論文提出一種新的應變量測系統與方法，此設計將組成一高靈敏度、精確、穩定而且架構簡單的擬靜態應變感測器，並針對其理論與可能之應用做研究探討。這感測架構包含了布拉格光纖光柵感測器、光纖型菲柏里-斐洛特光干涉濾波器以及光檢測器。其中光纖型菲柏里-斐洛特干涉濾波器是根據其基礎理論並由特殊的熔接法製作而成，主要是熔接兩種不同模態之光纖，並藉由無批覆膜之裸光纖的熔接面形成兩個反射鏡，使光通過後形成菲柏里-斐洛特的光干涉，進而產生濾波效果。最後以壓電致動器輸入不同形式之應變，測試布拉格光纖光柵的感測能力，由實驗結果顯示量測解析度可達0.145nm。此架構使用高靈敏度之布拉格光纖光柵應變感測器、高解析度之光纖型菲柏里-斐洛特光干涉濾波器以及模組化之光檢測器，不僅免除昂貴的量測儀器，如光譜分析儀，並且依然有高解析度以及自動化的量測特色。[[abstract]]A new experimental measuring apparatus for achieving high sensitive, accurate, stable and simple structure for static strain measurement is proposed. This method is based on the combination of a Fibre Bragg gratings (FBG) sensor and an fiber Fabry-Perot interferometric (FFPI) filter and a photodetector. The FFPI is formed by the two different mode fibers and used a multi-mode fiber to splice with two sections of signal-mode optic fibers by particular fusing method. The method produced reflective mirrors mechanism by fusing uncoated bare fibers. The optic light interfered in two reflective mirrors and FFPI could be a high accurate filter. The grating strained by Stack type piezo actuators. And the result demonstrates that the accuracy can reach 0.145nm. The method will provide a cheaper measurement apparatus with the characteristics of high resolution for potential automatic measuring device